I Have Had A Loss Of Appetite For The Past

I have had a loss of appetite for the past 5 days. Friday when I went to my physician, I weighed in at 156 lbs, but today when I weighed myself at home I weighed 144 lbs. I eat very little and only once a day because I'm forcing myself. I can feel my stomach rumbling and have hunger pains but I'm just not hungry for anything. nothing sounds good, not even my favorite foods and thinking of eating even makes me nauseated. whenever I do eat, I do not taste anything.